40 SUNFAR E300 SERIES
only an equipment as master can build protocol in network (named as “Inquire/Command”).
Other equipments as slaves only can provide data to correspond master “Inquire/Command” or
corresponding action for master’s “Inquiry/Command”. Master is PC, industrial machine or
programmable controller etc, and slave is inverter. Master not only visits some slave, but also
sends broadcast information to all slaves. For single master “Inquiry/Command”, all slaves will
return a signal as response; for broadcast information provided by master, slave no need offer
any feedback to master.
1．Data structure
Three kinds of data transmission for choice：
（1）1 bit start-bit, 8 bit data bits, 1 bit stop-bit and no check bit.
（2）1 bit start-bit, 8 bit data bits, 1 bit stop-bit and even check bit（manufacturing setting）.
（3）1 bit start-bit, 8 bit data bits, 1 bit stop-bit and odd check bit.
2．Baud rate
Five baud rate for choice: 1200bps, 2400 bps, 4800 bps, 9600 bps, 19200 bps
3．Communication mode
（
1）Adopt master “poll”, slave “response” point to point communication.
（2）Use inverter keypad sets inverter serial interface communication parameter, including local
address, baud rate and data format.
Data value（hex）
Data place
4．Communication rule
（
1） There are at least 5-byte startup interval time between data frames, only the message with
stated startup internal time is valid.
（2） Mater waiting time and inverter longest corresponding time is 8-byte transmission time. If
longer time, judge as communication failure.
（3） If inverter does not receive any message after communication overtime checkout time
(function code: F4.4
）, judge as wire-break. Then, based on communication auxiliary function
setting (function code: F4.3), it decides slave running state. (If receive any message during this
time, it will control under it.)
1.2.3 Message structure
Length of each message is between 11～18 bytes（based on data format）,Character type can
be ASC code and hex.
Ⅱ
Data showing rule: hex, high number before and low number after. Shown as bellow:
（1） ASC code of data 3800HⅡ ：
9 10 11 12
Set data Set data Set data Set data
33 38 30 30
Master set must be same as inverter baud rate and data format.
E300 Series Mini-type Integrated Universal Inverter Manual
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